Electromagnetic compatibility (always abbreviated to EMC) is the ability of various pieces of electrical and electronic equipment to operate without mutual interference. So far as amateur radio is concerned, the object is to achieve good EMC performance: that is, not to suffer from received interference or to cause interference to others. In recent years, the number of cases of serious interference to neighbours' equipment has declined markedly. This is due to a number of factors one of which is the coming of the EMC regulations which have made EMC a major factor in the design of all types of domestic electrical and electronic equipment. An even more important factor, however, is the appreciation by amateurs themselves of the need to design and operate their stations to minimise interference to neighbours. At the same time, the digital age has meant that interference to amateur reception (RFI) has become more of a problem.
Interference to and from an amateur station involve the same basic principles but dealing with them requires different procedures. For this reason, this chapter has been divided into two parts.
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